| 摘要 |
<p>In the technical field of sound reproduction by full-range electrostatic loudspeakers a problem exists in the drive circuit. The disclosed drive circuit overcomes the shortcomings of the prior specially designed amplifier, or step-up transformer types, rendering electrostatic loudspeakers more economically and acoustically competitive. Solved are the problems of: achieving an equalized pass characteristic complementary to the radically changing capacitive load and radiation resistance throughout the audio range - acoustically "flat", high efficiency, accurate high-voltage audio drive signals (smooth amplitude, phase and impedance transitions), appropriate impedance match to both the conventional low voltage, low impedance input amplifier and the loudspeaker, modest cost, ligt weight, compact. The drive circuit utilizes two specially designed audio transformers (T1, T2) in parallel-bilateral interconnection including R-C networks (R2, R3, C2, C3). One transformer (T1) for optimum response from 30Hz to about 5kHz, and the other transformer (T2) with cooperative added input impedance (R1-C1) for optimum response from a few hundred Hz to 20kHz. Resonant conservation of energy at high frequencies is employed. </p> |
